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1999
January Jan 1; 13 (1): 1 - 137 Jan 15; 13 (2): 139 - 237	February Feb 1; 13 (3): 239 - 371 Feb 15; 13 (4): 373 - 504	March Mar 1; 13 (5): 505 - 631 Mar 15; 13 (6): 633 - 753
April Apr 1; 13 (7): 755 - 911 Apr 15; 13 (8): 913 - 1050	May May 1; 13 (9): 1051 - 1210 May 15; 13 (10): 1211 - 1353	June Jun 1; 13 (11): 1355 - 1499 Jun 15; 13 (12): 1501 - 1641
July Jul 1; 13 (13): 1643 - 1761 Jul 15; 13 (14): 1763 - 1898	August Aug 1; 13 (15): 1899 - 2038 Aug 15; 13 (16): 2039 - 2189	September Sep 1; 13 (17): 2191 - 2337 Sep 15; 13 (18): 2339 - 2461
October Oct 1; 13 (19): 2465 - 2617 Oct 15; 13 (20): 2619 - 2749	November Nov 1; 13 (21): 2751 - 2903 Nov 15; 13 (22): 2905 - 3033	December Dec 1; 13 (23): 3037 - 3170 Dec 15; 13 (24): 3171 - 3293